9/6=21/d

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Solution for 9/6=21/d equation: 


D( d )

d = 0

d = 0

d = 0

d in (-oo:0) U (0:+oo)

9/6 = 21/d // - 21/d

9/6-(21/d) = 0

9/6-21*d^-1 = 0

-21*d^-1 = -3/2 // : -21

d^-1 = 1/14

-1 < 0

1/(d^1) = 1/14 // * d^1

1 = 1/14*d^1 // : 1/14

14 = d^1

d = 14

d = 14

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